migrated ACF to metabox with self made scripts. but when using datafields to be shown in i.e. products of a certain category fields do not show immediately after category is selected (like with ACF). first I have so save, publish and refresh the product to see the fields. - something I ca do to change this?
Do you mean you migrate data from ACF to Meta Box with your custom code, not with the feature "MB ACF Migration" of Meta Box?
And now you want to show some custom fields based on the selected category?